import java.util.Scanner;

public class PoundsToKilograms {
    public static void main(String[] args) {
        Scanner input = new Scanner(System.in);
        System.out.print("请输入磅数：");
        double pounds = input.nextDouble();
        double kilograms = pounds * 0.454;
        System.out.printf("%.1f 磅等于 %.3f 千克%n", pounds, kilograms);
        input.close();
    }
}